Doosan A2300 User manual

Service Manual
A2300 Diesel Engine
D15S-5, D18S-5, D20SC-5
G15S-5, G18S-5, G20SC-5
GC15S-5, GC18S-5, GC20SC-5
SB4106E01

1
Important Safety Information
Most accidents involving product operation, maintenance and repair are caused by failure to observe basic
safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations
before an accident occurs. A person must be alert to potential hazards. This person should also have the
necessary training, skills and tools to perform these functions properly.
Read and understand all safety precautions and warnings before operating or performing lubrication,
maintenance and repair on this product.
Basic safety precautions are listed in the “Safety” section of the Service or Technical Manual. Additional safety
precautions are listed in the “Safety” section of the owner/operation/maintenance publication.
Specific safety warnings for all these publications are provided in the description of operations where hazards
exist. WARNING labels have also been put on the product to provide instructions and to identify specific
hazards.
If these hazard warnings are not heeded, bodily injury or death could occur to you or other persons. Warnings
in this publication and on the product labels are identified by the following symbol.
WARNING
Improper operation, lubrication, maintenance or repair of this product can be dangerous and could
result in injury or death.
Do not operate or perform any lubrication, maintenance or repair on this product, until you have read
and understood the operation, lubrication, maintenance and repair information.
Operations that may cause product damage are identified by NOTICE labels on the product and in this
publication.
DOOSAN cannot anticipate every possible circumstance that might involve a potential hazard. The warnings
in this publication and on the product are therefore not all inclusive. If a tool, procedure, work method or
operating technique not specifically recommended by DOOSAN is used, you must satisfy yourself that it is
safe for you and others. You should also ensure that the product will not be damaged or made unsafe by the
operation, lubrication, maintenance or repair procedures you choose.
The information, specifications, and illustrations in this publication are on the basis of information available at
the time it was written. The specifications, torques, pressures, measurements, adjustments, illustrations, and
other items can change at any time. These changes can affect the service given to the product. Obtain the
complete and most current information before starting any job. DOOSAN dealers have the most current
information available.

A Series Diesel Engine Index
Index
Introduction
About the Manual...................................................... 5
How to Use the Manual .............................................5
Generic Symbols....................................................... 6
Definition of Terms .....................................................7
Illustrations................................................................ 8
General Engine Information
External Engine Components ....................................9
Engine Specifications...............................................11
Troubleshooting Logic
Engine Diagrams .................................................... 12
Problem Isolation and Correction ........................... 12
Troubleshooting Logic(List of Symptoms)............... 13
Coolant System
Cooling System Components and Flow...................53
Pressure Caps .........................................................56
Water(Coolant) Pump...............................................57
Thermostat...............................................................60
Gauges, Overfueling and Laoding...........................61
Cooling System Replacement Procedures..............62
Belt Tensioner Replacement................................... 62
Fan Pulley Replacement......................................... 62
Fan Hub Replacement............................................ 63
Water Pump Replacement.......................................64
Cup Plug Replacement............................................67
Fuel System
Fuel System Components and Flow........................68
Fuel System Malfunction Diagnosis.........................69
Air in the Fuel System..............................................70
Fuel Water Separator/Filter Unit ..............................71
Injection Pump .........................................................72
Governor Malfunctions.............................................72
Fuel Control Lever TRavel and Adjustment.............73
VE Pump Adjustment Screws..................................73
Manual Shut Down Levers.......................................74
Advance Timing Mechanism....................................74
Electrical Shut off Valves .........................................75
Injection Pump Timing..............................................77
High Pressure Fuel Line ..........................................78
Injectors....................................................................79
Fuel Drain Manifold..................................................81
Air System
Air System Flow.......................................................98
Diagnosing Air System Malfunctions........................99
Air Flow Restriction..................................................99
Damage from Non-Filtered Air...............................100
Pressure Side Air Leaks.........................................100
Exhaust Leaks........................................................101
Malfunctioning Turbocharger..................................101
Oil Consumption and Leaks...................................102
Turbocharger Noise ...............................................103
Rotor Assembly Clearance Measure .....................104
Lubricating System
Lubricating System Flow........................................113
Lubricating Oil Pump..............................................113
Pressure Regulating Valve.....................................113
Oil Coolers..............................................................114
Oil Filters................................................................114
Oil Filters Bypass Valve..........................................114
Low Oil Pressure....................................................116
Oil Level .................................................................116
Oil Filter..................................................................117
Oil Gauge...............................................................117
Oil Suction Tube.....................................................117
Bearings and Oil Pump..........................................117
Incorrect Oil Pump..................................................118
Oil Dilution..............................................................118
Coolant Diluted Oil .................................................118
Fuel Diluted Oil.......................................................119
Oil Leaks................................................................123
Electrical System
Electrical System Description/Operation................134
Electrical System Spec. .........................................136
Starting Motor.........................................................137
Engine Cranking Speed Too Slow .........................139
Alternator................................................................140
Fuel Shut Off Valve Check.....................................143
Oil Pressure Switch................................................143
3

A Series Diesel Engine Index
Base Engine Components
Operation and Description .....................................148
Cylinder Head and Valve Train ..............................149
Front Gear Housing and Gear Train......................150
Front Crankshaft Seal............................................150
Camshaft, Tappets and Push Rods .......................150
Flywheel Housing and Flywheel ............................151
Piston and Rod Assemblies...................................152
Crankshaft and Main Bearings...............................154
Oil Pan ...................................................................156
Base Engine Component.......................................156
Air and Fuel System...............................................157
Compression Check...............................................158
Piston Ring Seal ....................................................158
Valce Sealing .........................................................158
Valve Seal Wear.....................................................160
Front Gear Housing and Gear TRain.....................161
Rocker Levers........................................................162
Piston and Rod Assembly......................................163
Crankshaft and Main Bearings...............................165
Cylinder Block........................................................166
Flywheel Housing and Flywheel ............................166
Base Engine Componen Specifications.................168
Gear Train..............................................................169
Camshaft................................................................169
Tappets...................................................................169
Pistons ...................................................................170
Connecting Rod .....................................................171
Crankshaft..............................................................171
Cylinder Block........................................................171
Cylinder Bore .........................................................172
Base Engine Components .....................................173
Rocker Levers........................................................174
Rocker Levers Assembly .......................................179
Valve Clearance.....................................................179
Four Cylinder Engine .............................................179
Camshaft and Tappet.............................................180
Camshaft Inspection ..............................................181
Camshaft Bushing Inspection ................................182
Tappet Inspection...................................................183
Gear Housing or Gasket........................................186
Flywheel Ring Gear and Rear Sel.........................187
Brass Drift Pin........................................................187
Flywheel.................................................................188
In Chassis Overhaul...............................................189
Cylinder Head Removal.........................................190
Main Bearing Preliminary Inspection .....................191
Main Bearing..........................................................194
Piston and Rod ......................................................196
Piston, Pin and Connecting Rod............................197
Piston Ring Gap.....................................................202
Piston Rings...........................................................202
Piston and Rod Assembly......................................204
Cylinder Head and Gasket.....................................207
Cylinder Head.........................................................211
Valves.....................................................................214
Valve Seats ............................................................216
Cylinder Head ........................................................220
Hydraulic Pump Drive Gear and Shaft...................221
Balancer-Remove ..................................................221
Balancer-Install ......................................................222
Engine Replacement and Testing
Engine Replacement..............................................223
Engine Removal.....................................................224
Engine Installation..................................................225
Engine Testing........................................................227
Specifications
General Engine......................................................228
Fuel System...........................................................228
Lubricating Oil System...........................................228
Cooling System......................................................229
Air Intake System...................................................229
Exhaust System.....................................................229
Electrical System....................................................229
Drive Belt Tension..................................................229
Capscrew Markings and Torque Values.................230
Fraction, Decimal, Millimeter Conversions.............233
Newton-Meter to Foot-Pound Conversions............234
Pipe Plug Torque Values........................................234
Weights and Measures-Conversion Factors..........235
Special Tools
Special Tool List.....................................................237
4

ASeriesDieselEngine Introduction
5
Introduction
About the Manual
The procedures in this manual were developed for an in-chassis environment. The information has been grouped
by the main engine systems. The Table of Contents defines the systems. The index at the beginning of each
section subdivides the instructions for the various components of the system. Wrench sizes and special tools are
identified in the procedures as needed.
How to Use the Manual
The organization of this manual is based on the troubleshooting logic presented in Section 2. To fix a problem, find
the logic chart for the particular symptom. Follow the steps specified until the problem is corrected.
The left column of the charts indicates a probable cause. The right column provides a brief description of the
corrective action with a reference to the repair procedure or diagnostic discussion when appropriate.
The logic charts reflect three basic considerations:
1. Assumes the engine has provided satisfactory service prior to the problem.
2. Performing the easiest things first.
3. Most logical cause in descending order.
If the problem occurs with a new engine or after repair of the engine, the diagnostics discussion for each major
system will provide guidance for sorting out the cause of the problem.

ASeriesDieselEngine Introduction
6
Generic Symbols
The following group of symbols has been used in this manual to help communicate the intent of the instructions.
When one of the symbols appears, it conveys the meaning defined below.
Warning – Serious personal injury or extensive property damage can result if the warning
instructions are not followed.
Causion – Minor personal injury can result or a part, an assembly or the engine can be
damaged if the caution instructions are not followed.
The component weighs 23kg [50lb] or more. To avoid personal injury, use a hoist or get
assistance to lift the component.
Indicates a REMOVAL or DISASSEMBLY step.
Indicates an INSTALLATION or ASSEMBLY step.
INSPECTION is required.
CLEAN the part or assembly.
PERFORM a mechanical or time MEASUREMENT.
LUBRICATE the part or assembly.
Indicates that a WRENCH or TOOL SIZE will be given.
TIGHTEN to a specific torque
PERFORM an electrical MEASUREMENT.
Refer to another location in this manual or another publication for additional information.

ASeriesDieselEngine Introduction
7
Definition of Terms
The following is a list of guidelines for each procedure in the “repair Sections” of the Troubleshooting and Repair
Manual. The procedure will be given first; followed by a definition o the step or steps involved.
Check
Inspect
Test
Adjust
Visually
Inspect
Remove
Clean
Disassemble
Repair
Note
Replace
Install
Star Pattern
Torque
Sequence
Examine a component or system for damage, excessive wear, accuracy, safety, or
performance.
Examine a component or dimension to make sure it meets the required specifications.
Check or compare the performance of a component or system to established
specifications.
Complete the necessary steps to set or adjust the component, assemblies, or system in
the required setting or position.
Look for any obvious damage or problem.
Take off a component or assembly
Remove dirt, grease or other contamination.
Take the component or assembly apart.
Restore a component or assembly to a serviceable condition within the established
specifications.
Only the easiest and simplest repairs will be made to a component or assembly. If a
component or assembly must be rebuilt; it must be replaced with a new or Cummins
Diesel Recon, Inc. replacement or be rebuilt at a Cummins authorized repair location.
Install a new, properly rebuilt, or Cummins Diesel Recon, Inc. component or assembly
in place of one which is removed.
Place a component or assembly in the correct position.

ASeriesDieselEngine Introduction
8
Illustrations
The illustrations used in the Diagnosis Sections of this manual are intended to give an example of a problem, show
what to look for and where to look for the problem.
Most of the illustrations are generic and might not look exactly like the engine or parts used in your application.
Some illustrations contain symbols to indicate an action required and an acceptable or unacceptable condition.
The illustrations used in the Replacement Sections are intended to show replacement procedures when the engine
is installed in a chassis. The illustration may differ from your application, but the procedure given will be the same.
Unacceptable
Acceptable
Direction of Movement
(Action)